A format such as "pv --format '%16A %4A'" will behave the same as "pv --format '%4A %4A'" because only the last number takes effect. Track the numbers separately.
A format such as "_pv --format '%16A %4A'_" will behave the same as "_pv --format '%4A %4A'_" because only the last number takes effect. Track the numbers separately.